import cgi
import wsgiref.handlers

from google.appengine.api import users
from google.appengine.ext import webapp
from google.appengine.ext import db

class Greeting(db.Model):
  author = db.UserProperty()
  content = db.StringProperty(multiline=True)
  date = db.DateTimeProperty(auto_now_add=True)

class MainPage(webapp.RequestHandler):
  def get(self):
    self.response.out.write('<html><body>')

    greetings = db.GqlQuery('SELECT * FROM Greeting ORDER BY date DESC LIMIT 10')
    # alternately - greetings = Greeting.gql('ORDER BY date DESC LIMIT 10')

    for greeting in greetings:
      self.response.out.write('at %s ' % greeting.date)
      if greeting.author:
        self.response.out.write('<b>%s</b> wrote:' % greeting.author.nickname())
      else:
        self.response.out.write('An anonymous person wrote:')
      self.response.out.write('<blockquote>%s</blockquote>' %
                              cgi.escape(greeting.content))

    self.response.out.write('''
        <form action='/sign' method="post">
          <div><textarea name="content" rows="3" cols="60"></textarea></div>
          <div><input type="submit" value="Sign Guestbook"></div>
        </form>
      </body>
    </html>''')


class Guestbook(webapp.RequestHandler):
  def post(self):
    greeting = Greeting()

    if users.get_current_user():
      greeting.author = users.get_current_user()

    greeting.content = self.request.get('content')
    greeting.put()

    self.redirect('/')

def main():
  application = webapp.WSGIApplication(
                                       [('/', MainPage),
                                        ('/sign', Guestbook)],
                                       debug=True)
  wsgiref.handlers.CGIHandler().run(application)

if __name__ == '__main__':
  main()
